Aerodynamic noise prediction for long-span bodies

Jung H. Seo, Young J. Moon

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

A computational methodology is proposed for aerodynamic noise prediction of long-span bodies at low Mach numbers. The three-dimensional hydrodynamic field is computed by incompressible large eddy simulation, while its two-dimensional acoustic field at zero spanwise wavenumber is solved by the linearized perturbed compressible equations (LPCE). A far-field acoustic pressure is obtained by extrapolating the pressure fluctuations with Kirchhoff method, followed by a three-dimensional correction with Oberai et al.'s formula. The far-field sound pressure level for the long span is then estimated by a correction method, which is formally derived by revisiting the previous works of Kato et al. and Perot et al., along with discussion on finding the spanwise coherence lengths. The accuracy of the present method is assessed for broadband noise (with a broadened tone) from a flow with ReD = 4.6 × 104 and M = 0.21, past a circular cylinder of 30 cylinder-diameter span. The computed aerodynamic and acoustic results are found in excellent agreement with the experimental measurements.

Original languageEnglish
Pages (from-to)564-579
Number of pages16
JournalJournal of Sound and Vibration
Volume306
Issue number3-5
DOIs
Publication statusPublished - 2007 Oct 9

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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